How does the residency wavier free work?

[natshar]

My TESU enrollment is up in January. Let's say I can't graduate by December, what would have to do? Would I have to pay the residency wavier twice (once for one year, once for graduation)? Would I need to enroll in a course to TECEP to stay active? 

Also when does it count the one year? Your enrollment date or the date of your first course or something else?

Please explain all this. Thanks.